Weighing and mixing mechanism



June 4, 1935. D. c. JEFFREY Er AL 2,003,832

WEIGHING ANDMIXING MECHANISM Filed Deo. 21, 1932 7 Sheets-Sheet l 32. o A 1b o 52. nvenToYs,-

June 4, 1935- D; c. JEFFREY ET AL 2,003,832

WEGHING AND MIXING MECHANISM F1ed*Dec. 2l, 1932 7 Sheets-Shea?I 2 June 4, 1935. D. c. JEFFREY ET A1.

WEIGHING AND MIXING MECHANISM Filed Dec. 21, 1932 v-sheets-sheet I5 June 4, 1935. D, c. JEFFREY Er AL 2,003,832

WEIGHING AND MIXING MECHANISM Filed Deo. 21, 1932 '7 Sheets-Sheet 4 LPO ILH 141 Y e36 Invenoff'.

June 4, 1935 D. c. JEFFREY Er AL 2,003,832

WEIGHING AND MIXING MECHANISM Filed Dec. 2l, 1932 '7 Sheets-Sheva?l 5 lq/* in lat f I ww u w u LJ June 4, 1935- D. c, JEFFREY ET AL WEIGHINCT AND MIXING MECHANIS'M Filed DBC. 2l, 1952 7 Shee'LS-Sheeb 6 12 l lq IM q 57 ass mi I me lb p36 June 4, 1935- D. c. JEFFREY ET AL 2,003,832

WEIGHING AND MIXING MECHANISM Filed DSC. 2l, 1952 7 Sheets-Sheet 7 \7 iig. 2q

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L `3r1 ,me 33\\\/36 Ll/ /ul Patented June 4, 17935 UNITED STATES PATENT OFFICE WEIGHING AND MIXING MECHANISM Application December 21, 1932, Serial No. 648,180

22 Claims.

Our invention relates to weighing and mixing mechanisms, and it has for its object the provision of a new and improved form and arrangement of parts by which the proportioning of the ingredients or" a desired mixture may be controlled automatically and accurately. The ernbodiment of our invention as shown in the drawings is for use for the preparation of gypsum plaster in which the ratio between the stucco and the retarder must be kept uniform and true to specification if anything like satisfactory results are to be had in the use of the plaster.

As is well understood by those skilled in the art, when finely ground stucco is being delivered from the discharge chute at the bottom of a hopper, it is practically impossible to control the delivery accurately, and particularly when additional supplies oi stucco are at the same time being dumped into the hopper at the top so as to vary greatly the pressure of the stucco at the discharge opening, The diilculty is even more pronounced when the stucco is delivered to the hopper from the calcinlng cylinder before complete cooling of the stucco. We have found in practice in connection with screw conveyor for controlling the feed of stucco from the hopper that in many instances the stucco continues to flow through the screw for many seconds after the screw has been silenced, even when the screw extends horizontally a considerable distance from the point of delivery of the stucco to the screw so as to necessitate that the stucco move through a considerable number of complete turns about the silenced screw in order to escape. We have found in connection with a hopper provided with two screw conveyors adapted normally to deliver 1400 pounds of stucco upon each to 60 rotations of the screws that in the majority of cases pounds or more of excess stucco are delivered after the stoppage of the screws, that in many cases 300 to 500 pounds of excess stucco are delivered, and that in some cases as much as 900 to 1000 pounds of excess stucco are delivered.

It is one of the objects of our invention to provide an improved arrangement of mechanism comprising two containers operatively connected together so as to be movable vertically with respect to each other in a counterbalancing relationship whereby said containers have vertical movement with respect to each other when the ratio oi the weights in the two containers passes a predetermined critical value, means being provided preferably ior efiectlvely shutting oil delivery to said containers when the desired weight ratio has been reached. It is one of the objects of our invention to provide an arrangement of this type in which each of the containers is supported from a scale beam mechanism, and in which means is provided for automatically shutting off delivery to each container when a certain predetermined weight of materials has been delivered to the container.

It is one of the objects of our invention to provide an arrangement of this type comprising adjustable connections between the scale beams whereby the weight ratio may be changed readily and quickly when desired.

It is another object of our invention to provide means for automatically stopping the operation of the mechanisms for feeding materials to the respective counterbalanced containers, the feedinfT mechanism for one of said containers being stopped when the materials in the container reach a predetermined maximum weight, and the feeding mechanism for the other container being stopped when the materials in such other container are brought 'to the predetermined desired weight relationship to the materials actually delivered to said one container, whether such materials approximate in weight the predetermined desired maximum or otherwise. It is one of our objects to provide an arrangement of this type by which delivery of approximately the normal full amount or materials is made to one of the containers, by which the full amount of materials is then delivered to the other container, and by which an additional amount of materials is then delivered to said one container for establishing the desired weight ratio, such delivery of additional materials to said one container being preferably effected slowly so as to make it readily controllable for regulating accurately the amount delivered and thus making possible an accurate control of the desired weight ratio.

t is one of the objects of our invention to provide an arrangement of the type described in which means is provided adapted normally to prevent dumping of the contents of one or both of the containers until at least an approximately accurate weight ratio has been established.

It is another object of our invention to improve mechanisms of this type in sundry details hereinafter pointed out. The preferred means by which we have accomplished our several objects are illustrated in the drawings and are hereinafter specifically described. That which we believe to be new and desire to cover by Letters Patent is set forth in the claims.

In the drawings, which are shown more or less diagrammatically, and particularly with respect tween the counterbalancing mechanisms for the.,l

two containers;

Fig. 4 is an enlarged detail view, being a side f View of the magnet and connecteddog employedL in connection with the-means for throwing out of operation the clutch by whichY thefeeding means for one of the containers is driven;4

Fig. 5 is a top View of the clutch and cooperating parts by which the feeding means ior the container adapted to receive stucco is driven, certain of the parts being broken away for clearness ofillustration;

Fig. 6 is a vieW of a portion of the parts shown in Fig. 5 but illustrating a changed position of the parts;

Fig. 7 is substantially a vertical cross section taken at line i-l of Fig. 5;

Fig. 8 is a view upon an enlarged scale of a portion of the parts as shown in Fig. 7, but showing a changed position of the parts;

Fig; Q is a View similar to Fig. 8 but showing a third operative position of the parts illustrated;

Fig. `lO'is a View showing the clutch mechanisms and certain of the cooperating parts by `which materials are fed to the smaller counterbalanced container which in the construction illustrated is provided for retarder, such view being taken at approximately the line itl-l0 of Fig. 1;v

Fig. 11 is a View of the parts at the right of Figi() as seen from the right in said Fig. l0;

Fig. 12 is a top plan view of a portion of the counterbalancing means for the-smaller container, being substantially a section taken at line l2-l2 of Fig. l0;

Figs. 13, 14 and l5 are vertical sections taken respectively at the line l3-i3, the line -M, and the. line l5-i5, of Fig. 12, Fig 15 showing alsothe top platey extending above the parts shown in Fig. 12 and omitted from Fig. 12 for clearness of illustration;

Fig. 16 is a View toward the end oi one of the counterbalancing bars as shown in Fig. 12, substantially as seen at the line iii-i5 of Fig. 12;

Figs. 17 and 18 are views similar to Fig.V 16 but showing changed positions or" the parts;

Fig. 19- is a vertical section at line i9-l9 of Fig. 15, showing certain of the parts as seen from the right in Fig. 16, but with certain other parts omitted for clearness of illustration;

Fig. 20 is a view of certain ofthe operating parts as shown' in Fig. 10 but upon an yenlarged scale,`showing. certain of the parts diagrammatically;

Figs. 21, 22and 23 are views similar to Fig. 20 but showingv changed positions of the parts;

Fig. 24 is a top plan view of a portion of the partidas shown inv Fig. 20;

Fig25l is a View similar toFig. 2flbut showing a changed position of the parts;

Fig. 26 is a vertical section taken at line ZE-Z of Fig. l0 but upon a slightly enlarged scale;

Figs.` 27 andv 28 are horizontal cross sectionsr taken at the line 27-21 and the line 23-28 respectively of Fig. 26;

Fig. 29 is a view similar to Fig. 26 but showing the parts from the opposite side, and with some parts shown in Fig. 29 which are omitted in Fig. 26;

Fig. 30 is a detail view similar to a portion of the showing of Fig. 29 but illustrating a changed position of the parts;

Fig. 31 is a diagrammatic View showing certain of the parts as taken at line 3i-3i ofr 10;

Fig. 32 is a View similar to Fig. 3l but showing a changed position of the parts;

Fig. 33 is a Vertical section of certain of the parts as shown at line 35i- 33 of Fig. 29; and

Fig. 34 is a View similar to a portion of Fig. 29 but showing a changed position of the parts.

Referring to the several figures oi the drawings in which corresponding parts are indicated by the same reference characters, it indicates a hopper adapted to contain stucco, l i a hopper adapted tofcontain commercial retarder, i2 a container also in the form of a hopper into which a quantity of stucco is adapted to be delivered from the hopper iii, i3 a comparatively much smaller container to which a quantity of retarder is adapted to be delivered from the hopper il, and ii a mixer of any approved type to which the retarder and stucco are delivered from the containers i2 and i3 for Vthe desired mixing operation. In the arrangement shown, the container i2 is suspended from and supported a plurality of links i5 which are connected at their upper ends to horizontally disposed levers it, i?, it and i9 which in turn are supported from above by links Zi depending from a `frame-work and a link 22 connected with a lever 23. the levers ifi and il are connected with the levers i8 and i9 respectively by short vertically extending links i505 and The lever 23, in the arrangement shown, is supported at its middle point by a link 241 depending from the frame-work 2i, with a link 2.5 extending downwardly from the end opposite that to which the link E2 is connected, the link being connected at its lower end with a lever 2E which is pivoted at its central point upon a frame support il indicated diagrammatically by av dotted line. The opposite end of the lever 2@ from that to which the link 25 is connected, has a connection by means of a link f 28 with a scale beam 2d which in the arrangement shown is in the form o1" a doublek bar (see Fig. 3), such scale beam 2Q being suspended from a link 3@ from a suitable portion oi' the framework. The depending weight carrier 3l is alsoy in the form of a link provided with a plate 32 at its lower end for receiving a plurality of weights 33. As shown in Fig. 3, each or" '1e bars of the scale beam 28V is provided with a slidably mounted weight inthe usual form, the two weights being indicated by the numerals and respectively.

The bars upon which the weights Sii and 35 are mounted are graduated in the well-known manner.

'Ihe smaller 'container i3 is in the form of a scoop whichis adapted to be tilted for emptying it, being pivotally mounted upon two links 36 which in turn. are pivotally mounted onv upright bars 3l. The bars 3l in turn are pivotally mounted upon a horizontally disposed bar 33, as is best shown in Fig. 15, which bar 33 is Xedly mounted upon the end portions of oppositely disposed bars 39 and lili, the pivotal connectionv with the bars v37 being eected through the medium of knives il cooperating with grooved blocks 152.

The ends of At their middle points, the bars 39 and 4U are pivotally supported from a yoke 43 which is connected with a heavy plate 44 forming the top wall of the hopper II, such platey 44 being extended beyond the hopper at one end, as is clearly shown inFig. 10. The pivotal connection between the bars 39 and 4i) and the yoke 43 is effected through the medium of knives 45 and grooved blocks 46 as is clearly shown in Fig. i3. At their opposite ends, the bars 39 and 40 are oifset inwardly toward each other, as is clearly shown in Fig. 12, such ends being connected by means of a knife 41 with a weight supporting member 43 in the form of a link as best shown in Fig. 10, such link 48 being provided with a plate 49 thereon at its lower end for supporting a plurality of weights 50 thereon.

The arrangement of the hopper I2 and the train of levers and links by which it is connected with the scale beam 29 is such that the hopper is supported in counterbalanced relation to the Weights 33 carried by the link 3i. In the arrangement shovm, the relationship is 20G to l, so that weights 33 having an actual weight of 7 pounds are adapted to counterbalance 14S() pounds of stucco in the hopper i2. The train of levers and links as shown is merely illustrative of one arrangement by which the desired counterbalanced relation is effected between the scale beam 2S and the hopper I2; any desired arrangement may be employed. The arrangement of the container Ii and its counterbalancing levers and connections is such that a pound of retarder in the scoop I3 is adapted to balance a pound weight 5e on the link 48. In the arrangement shown, a weight 5i is mounted upon the link 48 for counterbalancing the operating mechanism for establishing the l to l relation. As is clearly shown in Fig. 3, the lower ends of the links 3l and 48 are pivot-ally connected together by means of a link 52 which is arranged to bear at an intermediate point against a knife edge device 53 which is adjustably mounted upon a horizontally disposed bar 54 iiXedly mounted in position upon any suitable portion of the frame-work. The arrangement is such that when the weights 33 and 5S are standing in their lowered positions the bar 52 is out of engagement with the knife edge device When, however, materials have been added to the hopper I2 for raising the weights 33 as shown in Fig. 3, or materials have been added to the scoop i3 for raising the weights 5i! to their uppermost position, under such circumstances the bar 52 is brought into engagement with the knife edge device 53. The arrangement is such that the links 3l and 48 cannot stand in their uppermost positions at the same time. With the scale bar 29 in its raised position by reason of a quantity of materials in the hopper I2, the link 48 is not able to risc to its uppermost position until the materials in the scoop i3 exert sufficient pressure upon the link 48 for drawing the link 48 upwardly against the upward pull on the link 3i. With the knife edge device 53 at its mid point between the points of connection of the bar 52 with the links 3i and 48, the eifective weight relationship between the containers I2 and I3 is in the arrangement above described 200 to l. When, however, the knife edge device 53 has been shifted along the bar 54 to a changed position for changing the leverage of the bar 52 considering the knife edge device as the fulcrum, thek relationship may be made either less or greater than 200 to l, and by movement of the knife edge device 53 to the required position therefor the ratio may be regulated as desired. In the arrangement shown, the bar 54 is graduated for indicating the different positions of the knife edge device 53 for effecting the different desired weight ratio relationship between tlie containers I 2 and I3.

By the arrangement as above described, it will be appreciated that with weights 33 on the link 3i representing 7 pounds so as to require 1400 pounds of stucco in the hopper I2 for counterbalancing, and with weights 5H on the link 48 weighing i pounds for counterbalancing 4 pounds of retarder in the receptacle E3, and with the knife edge device 53 in such position that a 7 pound upward pull on the link SI counterbalances a 4 pound upward pull on the link 48, the mechanism is in condition for use for weighing out ingredients at a ratio of 1400 to 4. If an excess weight of stucco should be fed to the hopper i2, and if then 4/1400 of such excess weight of retarder should be added to the scoop I3, the two containers I2 i3 would be brought to balanced condition with respect to each other through the bar 52 even though each oi said containers were out of balance with respect to the weights 33 and 59.

In the construction illustrated, a drive shaft 55 is provided extending underneath the hopper lil, connected by means of bevel gears 5S and 5'! with worm conveyors 58 one of which is shown in 5. The worms 58 operate in troughs 59 which extend along underneath the hopper I il for receiving stucco from the hopper through chutes Sill, the troughs 5i? standing at their outer ends above the hopper I2 for emptying thereinto. A driving pulley Si is revolubly mounted upon the shaft 55 (see Fig. 5), being driven from any suitable source of power by means of a belt 52. A clutch mechanism of any suitable type is provided ior connecting the shaft 55 with the drive pulley GI, the clutch as illustrated comprising a slide block 64 through the medium of which the clutch is thrown into and out of operation. ln the arrangement shown, when the slide block 64 is moved toward the driving pulley 6 i, the clutch is made operative for driving the shaft from the pulley. When the slide block 64 is moved outwardly away from the pulley 6I into the position as shown in 5, the clutch is thrown out of operation. The arrangement is such that when the clutch is thrown into operation 'oy movement of the slide block 64 toward the pulley 5I -to the position as shown in Fig. 6, the clutch is normally held in operation until the slide block 64 is moved outwardly by a force supplied thereto independently of the clutch.

In the arrangement shown, the means for throwing the clutch into and out of operation comprises a lever @E pivotally mounted upon a bracket 5E mounted upon the hopper H, such lever having a link Si pivotally connected therewith so as to be movable by the lever toward and from the shaft 55. At a point adjacent to the shaft 55 (see llgs. 5, 6 and i), the link 5l is pivotally connected with a. bell crank lever 53 which is pivotally mounted upv-on the frame-work so as to swing horizontally. The bell crank lever 68 is connected by means of a link E8 with an operating lever 'ld which is pivotally connected with the slide block 54. The arrangement is such that when the lever 55 is moved in clockwise direction in Fig. l the link 5l is moved toward the shaft 55 and the clutch 53 is thrown into operation.

The means for throwing the clutch out of operation comprises a pivotallyv mounted arm l! extending downwardly adjacent to the shaft 55 adapted to cooperate with a cam l2y nxedlyv mounted upon the shaft 55 in position to engage a roller 'ld carried by the arm l t. The arm 'il is pivotally connected at an intermediate point with a link iii which extends along the side of the hopper it; Ait its end removed from the shaft 55, the link ifi is provided with a block l5 against which a pivoted dog 'i5 is adapted to bear for preventing movement oi the link lit towardthe shaft 55. The dog 'i5 is pivotally mounted upon a suitable portion of the framework-being connected at an intermediate point with an armature l'i o1" an electro-magnet lil. When the magnet energized, the armature ll is drawn upwardly releasing the dog from the link lli so as to permit such to move toward the right in Figs. 4 and 5. At the end portion or" the link 'it adjacent to the arm li, the link l'fl extends through an opening in a bracket lil which is rigidly connected with a slide bar winch is connected by means of a link Si with the bell crank lever t3, as is clearly shown in Figs. 5 and S. The link 'lli is provided at a point between the arm il and the bracket 'i9 with a collar 52 which serves as a bearing for a spring S3 interposed between the collar and the bracket le. The arrangement is such that when the link fl is moved toward the rig t into the position as shown in Fig. 6 ier throwing the clutch into operation while at the saine time the dog 'l is holding the link 'ist from movement toward the right in Figs. 5 and G, the spring is compressed ias indicated by a comparison of Figs. 5 and 6.

When thereafter the dog l' is released, the spring 83 serves to move the arm 'ii toward tie shaft 55, into the position as shown in Fig. 9.

At its end aortion adjacent to the shaft 55, the slide bar 8i! is provided with two plates Sil rigidly connected thereto, such plates fifi being provided with slots S5 therein (see Figs. 8 and 9), connected by means oi` a pin 85 with the arm li. By reason of the provision oi the slots E5, upon the movement of the arm ll toward the shaft, the slide bar 39 is permitted to remain in unchanged position. Upon such movement of the arm 'il toward the shaft a pawl pivotally mounted upon the pin is moved toward `the right from the posion as shown in Fig. 8

to the position as shown in Fig. 9 opposite the end of the slide bar When the parts are in the position as shown in a spring S8 carried by a bracket Eil mounted upon thearm li by upward pressure on the pawl el' lifts such pawl into engagement with a pinii as shown in said Fig. 8 so as to stand above the ond or" the slide bar 85. When the arm il is moved toward the right, however, into the position as shown in Fig. 9, the changed angular position oi the bracket 89 permits the pawl Sl' to move downwardly into engagement with a pin el so as to stand opposite the end of the slide bar Si With the parts in the positionas shown in Fig. 9, and

'with the shaft 55 being driven in clockwise diandasse sition to be engaged by the dog 'i5 as shown in Figs. i and 5. The arrangement is such that the link is held by its operative connection with the clutch in the position as shown in Figs. 4 and 5 whether or not the dog ll has been lowered again into operative engaging position following its last preceding operative upward movement by the magnet le.

Means is provided for automatically throwing the feeding devices 5t out of operation when a certain predetermined amount of materials has been fed to the container i2. This means comprises a mercury switch 92 pivotally mounted in position upon any suitable part of the framework l above the scale beam 29, as is clearly shown in 3. The switch 92 is in the form of a glass bulb or other container holding a quantity of mercury 53 therein in such relation that, when the container stands in the position as. shown in said Fig. 3, a circuit is completed through leads :lil ci an electric circuit by which the magnet i8 is connected with a suitable source of electrical energy. The container d2 is adapted. normally to stand in operative circuit closing position as shown in Fig. 3, but is adapted to be swung in counter-clockwise direction in said Fig. 3 so as to cause the mercury to shift in position for opening the circuit (llupon a downward pull upon a connected link Q5, the lower end of .vhich is provided with a loop 96 embracing the end of the scale bar 2Q. The arrangement is such that when the scale bar 29 stands in its lowered position, as when the hopper i2 is empty, the switch Q2 is held open by the link 95. When however, stucco has been ied to the hopper l2 so as to cause the weights .'53 to be counterbalanced thereby, the scale bar 29 rises for moving the switch into the position as shown in said Fig. 3 for closing the circuit dll. When the weight of the stucco delivered to the hopper l2 reaches the predetermined maximum weight as determined by the number ci weights 33 on the link 3l, the circuit through the magnet i8 is closed and the pawl i5 is lifted for permitting the link 'M to move toward the right in Fig. 4 as above described or initiating the action by which the clutch 53 is thrown out of operation and the feed of the stucco by the feeding devices 58 is stopped.

The means for feeding retarder from the hopper il to the scoop i3 comprises a shaft 97 (see 1G), which has connected thereto a screw 93 in the lower end portion of the hopper, such screw feeding device being ci any approved type adapted by rotation to carry retarder from the hopper H and deliver it toward the right in said Fig. lll. ln the construction shown, a rotary screen device SS is mounted upon the shaft 97 so as to rotate therewith within a housing lili) arranged opposite hopper il, the feeding screw d8 being adapted to deliver the retarder to the interior of the screen 9?; from which the retarder escapes by a sifting action through the wall so as to drop into the scoop i3. The housing it is provided with a closure flap lill pivotally mounted thereon at the bottom thereof for stopping definitely the delivery of retarder from the rotary screen to the scoop |3 in the desired timed relation regardless of any sifting of retarder through the screen after the rotation of the screen has been stopped as hereinafter described.

In the arrangement shown, two different driving means are provided for the shaft 91 and the feeding device 98. This plural driving means comprises a clutch disc |32 rigidly mounted upon the shaft 0l between cooperating clutch discs |03 and IIif-l, the former of which is connected with a high speed driving chain I 05, and the latter of which is connected with a low speed driving belt |06. The arrangement is such that when the shaft 91 stands in the position as shown in Fig. 10 the clutch disc |02 is adapted to rotate freely between the discs |03 and |34 without driving either of said discs. When the shaft 91 is shifted toward the left in Fig. 10, the clutch disc I 02 is brought into operative engagement with the clutch disc |04 so as to cause the shaft to be driven at low speed through the medium of the belt |05 from any suitable source of power. When the shaft 91 is shifted toward the right in said Fig. 10, the clutch disc |02 serves by engagement with the clutch disc I 03 to connect the shaft with the high speed driving chain |05 for driving the shaft from any suitable source of power.

The position of the shaft 91 longitudinally thereof is controlled by a lever |01 which is provided with a lug |08 at one face thereof as is best shown in Fig. .l1 adapted by engagement with the groove |09 in a drum IID to move the shaft either toward the right or the left in said Fig. 10 and to hold it in the desired changed position while permitting free rotation of the shaft.

In the arrangement shown. a brake for stopping the rotation of the shaft 91 is provided comprising a head I|| mounted upon the shaft with a brake band I I2 extending thereabout and adapted to be tightened in position for stopping the rotation of the head and the shaft by frictional engagement therewith. In the arrangement shown, the brake band I I2 is connected with a suitable link I I3 at its free end, such link being connected with a lever |4 which is pivotally mounted upon a horizontal axis by means of a bolt I|5 at an intermediate point, the opposite end of the lever I |f| being connected by means of a link IIS With the end of a lever I I1. The arrangement is such that when the lever I I1 is moved in clockwise direction about its axis, the lever |I4 is moved in counter-clockwise direction (see Fig. 22), serving to exert an upward pull on the link I I3 for tightening the brake band I I 2 about the head I I I.

The means for supporting the scoop I3 from the bars 31 and for giving the scoop the required tipping movement for dumping the contents of the scoop inte the mixer I4 will now be described. .As is `shown in Figs. l0 and 30, the scoop I3 is provided at its opposite sides with obliquely disposed blocks IIB connected by spot-welding or in any other suitable manner. the connection of the links 36 with the scoop being effected through the medium of said blocks. The blocks II8 extend a short distance beyond the body of the scoop, the outer ends of the blocks II8 being pivotally connected with short links IIS which in turn are pivotally connected with the lower end portions of the bars 31. The arrangement is such that the Weight of the scoop I3 serves to hold the scoop normally in horizontal position as shown in Fig. 29. The scoop I I3 is likewise indicated by dotted lines in Fig. 26 indicating the relative position of the scoop even though the scoop is not Visible at the line 26-26 of Fig. 10.

The means for moving the scoop into dumping position as shown in Fig. 30 comprises a slide block |20 (see Fig. 34) which is slidably mounted upon a horizontal bar I2| carried by the vertical frame bars |22 by which the hopper II is supported. As is clearly shown in Fig. 27, the slide block |20 has a link |23 pivotally connected thereto on the face thereof adjacent to the hopper I I, the opposite end of said link |23 being pivotally connected to an upright lever i2@ as is clearly shown in Fig. i. rThe arrangement is such that when the lever |24 is swung toward the left in l by the operator, the slide block I 20 is moved toward the right in 26 and 27 and toward the left in Figs. 29 and 34.

On the opposite face of the slide block |20 from that at which the link |23 is connected, We have provided a bracket |25 (see Fig. 27), which is connected at one end with the block |20 and at its opposite end portion stands in spaced relation to the block. As is best shown in Fig. 27, the bracket |25 extends between the scoop I3 and the adjacent link 3E, such link 36 being provided with a pin |25 which extends into and through a notch |21 in the lower edge of the outer end portion of the bracket |25 (see Fig. 30). The arrangement is such that upon the initial portion of the movement of the slide block |23 toward the right in Fig. 26 the link 3B is caused to swing toward the right in said figure, or

toward the left in Figs. 29 and 34, causing the block II 9 to swing also toward the left in said Figs. 29 and 34 and serving to cause a tipping movement of the scoop I 3. At an intermediate portion of the movement of the bracket |25 the parts are in substantially the position as shown in Fig. 34|, and at substantially the end of the movement of the slide block |20 and bracket |25 toward the leftin said figure the parts assume the position as shown in Fig. 30, with the scoop I3 standing in position for completely dumping all contents therefrom. Upon a return movement of the slide block and bracket toward the right in said Figs. 29, 30 and 34, the opposite end of the notch |21 is adapted to engage the pin |25 for swinging the link 38 and the block I9 in the reverse direction for bringing the scoop I3 again to its normal horizontal position as shown in Fig. 29.

The means for controlling and operating the lever |01 for throwing the clutch plate |02 into engagement alternatively with the clutch plates |03 and |04 comprises a magnet |28 fixedly mounted in position between frame bars |29 as is clearly shown in Fig. 10, such magnet being connected by leads |33 with a suitable source of electrical energy and including a mercury switch I3! as shown in Figs. 16, 17 and 18. As is clearly shown in Fig. 16, the mercury switch |3I is mounted substantially opposite the end of the scale bar 35 to which the vertical scoop supporting bars 31 are pivotally connected, being the end of the bar adjacent to the line I B-I of Fig. l2. The container comprising the body of the switch I3! is carried by a bar I 32 at right angles thereto, such bar |32 having a bar |33 rigidly connected therewith in parallelism with said container portion of the switch. The bar 33 is supported by a pin |34 extending from one face of the scale bar 39, and a second pin |35 formed on the end portion of a. bar |35 pivotally mounted on the outer face of the scale bar 39. In the arrangement shown, the bar |36 is mounted upon the bar 3.9 by means of a knife |31 extending from the face of the bar 39 as shown in Figs.

Zand .1.4 .thearrangement `beine :such 4,that the .lbar .it .isedapted to have .a vertical `swinging motion ireely vwith respect :to ythe bar et.

' tudinally'of .thebari A bracket iidextending from .the hopper il normally supports the ,barllfandthe weight teso as 4to hold the bar 36 in about the position as illustrated in Fig. 15 inspacedrelation to the .pin itt. The rarrangementis such `that when the scale .barse .and il@ are ,swung upon their pivotal mountings .by

.reason of .the feed .of .retarder to .the .scoop i3 lseas ,toicause such .retarderV =and .scoop .toV become balanced with respect .to the weights 5t, shortly after .thestart of .suchswinging movement of the bar 39 the pin l is .brought into contact with the .upper .edge of .the .bar 435 serving to apply the weight t3@ Aeffectively to the bars 3Q and -fi tor ,preventing further swinging movement .of .the v.bars .3,9 Tand il@ .downwardly with vthe scoop li3, .serving .to holdthe scale bar ,Sin theposition .as show-n in-Fig. 17.

With the partsinthe condition as shown in "Fig ,16, with .theiscoop L3 empty, the bar .933 is supported in .obliqueposition for holding the body of `.the switchi 3i `in position for maintaining the circuit ltilopen. When, however, the .bar 3.5 is

.swung downwardly with .respect to the bar 3.55,

.into the position Aasshownin Fig. 17, which represents the position of the parts when the downward .movement of the bar .3e is stopped through the .medium of .the `weight v|39 connected .to the .bar .3B :by vthe pin it, .the pin .itil is suiciently lowered with respect .to .the pin .35 for .causing the bar .liand .the switch 1.3i to swing past the horizontal into oblique .position in the opposite direction for -closing the ,circuit ist `and serving thus to. energize the magnet 1.2.8. Upon such .swinging movement of the Abar 33, it is brought Vinto contact with .a pinv Uil which depends from 'the plate lili, .such'pin MI in the arrangement shown serving to cooperate with the pins l 3i- .and .for thesupport of the bar 33 and the .switch 13|. Upon fur-ther downward movement of .the bar 39 in the manner Ahereinafter described, the pins E35 and i3d .are moved downwardly together for causing the bar 1.33 and .the lswitch body i3! again to .swing .past the horizontal into about the same Yangular position kas that shown in Fig. i6 for bringing the right-hand end of the bar .3.33 into Yposition upon A.a pin AM12-also depending from `the plate Such further downward .movement of the bar 3S for bringing vthe bar B33 into position upon the pins Ml and l .12 serves again to .open the circuit `36 for .decnergizing ,the magnet Y 28. A pivoted link M3 is connected with the bar H32 `for holding the switch i3! adjustably in the approximate desired position.

As is best shown in Figs. 20 to 23, the magnet t28 is surrounded-by avsuitable shell type vof core |44 serving as a'return path for the lines oi magnetic force. An armature M5 slidably mounted in a .suitable openingin the magnet and core Miri '.isadapted to be rnoved upwardly by the force of' the .magnetism when the circuit through the leads i3@ iis closed and is adapted to move downwardly to the position as shown in Figs. 20 and ..21 when .the circuit through said leads itil is opened.

spect .to .the .notch directly below .said bar .Mi-.6.

-At opposite .sides .of .the notch iii-l .there are pivotally mounted ltwo links Mea-nd Aii-.E which :in turn are .connected at their opposite .ends :by

.means'oi two other links teil and 55, the four .links .in question being pivotaily connected with eachother inseriesrarrangeinent so as .to .enable the end links lli-,Sand let toswing about their axes with .respect .to .the :bar tilt and .so `to permit .the intermediatelinks icand Siti to-be buckled orstraightened with-respect to-.each other between the .end links. Asis best shown in Figs. 2e and 25, the pivotal connections between the end links and the .intermediate .links comprise .pins or rods 152 and the .ends .ofsaid .rods .at eachside of the-'bar Hit being connected together by a coiled .spring itil. The arrangement is such that .the springs i tilt which .are indicated diagrammatically 'by dotted lines in .each of Figs. .29 to,.23 have a tendency to buckle the intermediate Ylinks .i15l and 51 with respect to each other into substantially the position as shown in Figs. 2G and .2l as distinguished trom the comparatively straightened condition with respect .to each other as illustrated -in Figs. 22 Vand 2?.. The intermediate .links 52! and Il are'pivotally connected together by means comprising a-pin or bolt E55 to which links 56 and i5? are connected at their upper ends, 'having their lower ends operatively connected ywith the armature yMie so as to 'be free to swing horizontally with respect thereto. The arrangemen-t is such that when the circuit through the leads ist is open the `springs itil heid the links l 53 and l5 in buckled condition with respect to each other. When, however, the circuit through said leads itil isc'losed, the armature Mii is drawn upwardly as above suggestedserving to straighten the links i5@ and fiifl more or less completely with respect to eachother into the position as shown in Figs. '22 and 23.

Upon Vthe bar Aitil at the left of the notch lill as .shown in Fig. 20,1we have mounted an arm or lever '58 which is .adapted to :swing horizontally from the position Aas .shown in Fig. 24 to the position as shown in Fig. 25. When in the position as shown in Fig.. 2li, the lever 58 engages a stop Apin l-e carriedby one end of a cross bar 16E), and when the lever ite-stands in the alternative position it engages alstop pin iti mounted'upon the opposite end portion of said cross bar Mit. A spring itil indicated diagrammatically is connected with a pin" 53 carried by the free end of the lever i515, said spring being connected at its opposite end with a standard it@ at the opposite end portion of the bar i533. The is such that the spring M52 serves to hold the lever yieldingly in either of the two alternative posi tions as above suggested, being adapted to pass centers with respect to the axis upon which the lever 158 is mounted in its movement from one position to the other. In the arrangement shown, the arm or lever 53 is carried by a hub portion it which is pivotally mounted upon an eccentric Ypin portion E56 revolubly mounted in a cylindrical bearing it? carried by the bar itt. At its -The bearing for the link |69 upon the pin or rod |53 is such that the link |69 is adapted to swing horizontally with respect to the pin |53 to the extent necessary for permitting rotation of the hub portion |65 about the axis of the eccentric pin |66. The arrangement is such that when the lever |56 swings from the position as shown in Fig. 24 to the position as shown in Fig. 25, the link and the pin or rod |53 are moved toward the right in said Figs. 24 and 25, serving to swing the end links |48 and |49 also toward the right from the position as shown in Fig. 20 to the position as shown in Fig. 2l. As will be readily understood, when the lever |58 is given a return swinging movement again to the position as shown in Fig. 24, the link |69 and the short end links 48 and |49 are again swung toward the left in said Figs. 20 to 23.

Means is provided for swinging the arm or lever |58 between the limits of its motion as above described, such means comprising a link |18 connected with the pin |83 at the end of said lever |58, such link |18 being connected at its opposite end with a lever |1| pivotally mounted upon the horizontallyv disposed bar |2| (see Fig. 26). At the end of the link |18 at the left as shown in said Fig. 26, such link is provided with a notch i12 adapted to engage a pin |13 extending from the face of the lever I 1|, the arrangement being such that when the lever |1| is swung toward the right in Fig. 26 the link |10 is also given a movement toward the right in said figure serving to move the arm or lever |58 against the action of the spring I 62 from the position shown in Fig. 24 to the position shown in Fig. 25. Upon a reverse movement of the lever |1| toward the left in said Fig. 26, the arm or lever |58 is moved against the action of the spring |62 from the position as shown in Fig. 25 to the position as shown in Fig. 24. For guiding the lever |1| in its movement, a bar |14 is provided extending between the vertical frame bars |22 adjacent to the hopper The lever |1| is located between the bar |14 and the hopper, and is provided with a tongue |15 which extends over and downwardly opposite the outer face of said bar |14 for guiding the lever in its movement. A link |16 serves to connect the lever 1| at an intermediate point with the lower end of the lever 65 above referred to by which the clutch 63 is thrown into operation. The arrangement is such that when the lever 65 is given a swinging movement for throwing the clutch 63 into operation the lever |1| is moved toward the right in Fig. 26 for moving the arm or lever |58 into the position as shown in Fig. 25 and corresponding to the position of the parts as shown in Fig. 21.

As is clearly shown in Fig. 20, a lever |11 is pivotally mounted upon the bar |46 at the left of the notch |41 in position to be engaged by the pin |55 when the parts are in the position as shown in Fig. 20 in which the springs |54 are holding the intermediate links |50 and |5| buckled with respect to each other and serving thus to hold the pin |55 in its lowered position. The lever |11 has a link |18 pivotally connected with an intermediate portion thereof, such link being connected at its opposite end portion with the ap or gate |6| as shown in Figs. 3l and 32. In

the arrangement shown, the connection between the link 18 and the `flap itl is eieoted by the use of an angle piece |13 secured to the outer face of the fiap and having an opening through which the iink |18 extends, with a pin 86 extending through an opening in the link $18 for preventing withdrawal of the link. A coiled spring 56| is mounted upon the link |18 above the angle piece i'iSi, bearing at its up end against a collar |82 fixed on said link. Ti arrangement is such that upon upward movement oi 'the link :'18 the door or flap lili is moved into its opened position as shown in Upon subsequent downward movement of the link 18, the flap or door iti moved yieidingly into closed position as shown in Fig. Si..

As is shown in 2Q, the link E16 at an intermediate pcint is provided with a bracket |83 finedly mounted thereon, such bracket at its outer end being connected with a heavy coiled spring |85 which is connected at its opposite end with a bracket |85 connected with one of the vertical frame bars the arrangement being such that the spring |84 normally holds the link |18 in its raised position corresponding to the open position of the gate or flap |6| as shown in Fig. 32. When the lever |11 is held its lowered position as shown in Fig. 20, the link |18 is then held its lowered position against the action of the spring 86. serving to hold the gate or flap |0| closed as shown in Fig. 3l. When the end links |58 and |49 as shown in Fig. 20 are swung toward the right to the position shown in Fig. 21 at the time when the arm or lever |58 is swung to the position as shown in Fig. 25, the pin or bolt 55 is carried toward the right out of engagement with the lever |11, whereupon the spring |84 serves as above described to raise the link |18 for opening the gate or flap I6 and serving also to move the lever |11 to a raised position as shown in Fig. 2l as compared to the position as shown in Fig. 20.

When the links |46 and |49 are swung toward the right into the position as shown in Fig. 2l by reason of the changed position of the arm or lever |58 as above described, the clutch lever |01 is at the same time swung toward the right through the medium of a link |86 which is pivotally connected at one end with the upper end of the lever |01 and is connected at its opposite end with the pin or rod |52 by which the links |48 and |50 are pivotally connected together. The arrangement is such that upon such movement of the lever |81 toward the right into the position as shown in said Fig. 2l the clutch plate |62 is brought into operative engagement with the clutch plate |03 (see Fig. l0) for connecting the sprocket chain |65 with the shaft 91 for effecting the high speed operation of the feeding device S8 by which retarder is fed to the scoop i3. When suiiicient retarder been delivered to the scoop I3 for counterbalancing the weights 59 as above described, the scale bar 39 is given an initial movement downwardly as shown in Fig. 16 for bringing the parts to the position as shown in Fig. l'? serving to close the circuit through the leads |36 for energizing the magnet l 23. The armature |45 is then drawn upwardly serving to straighten the links |58 and I5! more or less completely into the position as shown in Fig. 22. Inasmuch as the link |46 is held rigidly in position by reason of its connection through the link |69 with the pin |58 carried by the arm or lever |58, such upward movement of the pin or bolt |55 serves to swing the end link M8 toward the left from the l|20 the arm the lever 65 is again operated for throwing the clutch 83 into operation, since otherwise the clutch would be again thrown out of operation immediately following its movement into operation.

Means is provided for taking the pressure of the weight |39 from the scale bars 39 and 40 for the operation of dumping the contents from the pivotally mounted scoop I3 after the final balancing has been eifected, the removal of the weight serving to destroy the balance so as to prevent oscillation of the parts during the dumping operation. This means comprises an arm |89 pivotally mounted upon a cross bar |90 extending between the upright frame bars |22 (see Figs. 26 and 29), the free end of the arm |89 being adapted normally to rest upon the upper edge of the slide block |20. When the slide block |20 is moved toward the left in Fig. 29 for giving the scoop I3 la dumping movement as above described, the slide block |20 is moved from beneath the arm |89 so as to permit the arm to drop into position upon the cross bar |2I as shown in Fig. 34. At an intermediate point, the arm |89 has a link I9I pivotally connected therewith, such link I9! extending partially around the hopper II and upwardly along the side of the hopper as is clearly shown in Figs. 10 and 26. At its upper end, said link |9| is pivotally connected with an arm |92 pivotally mounted upon said hopper the arm |92 being provided with a weight |93 upon one end in position to move the arm |92 and the connected link |9| downwardly when the slide block |20 is moved out of engagement with the arm |89. At its opposite end, the arm |92 underlies the end of the arm or lever |36. The arrangement is such that When the arm |89 1s resting upon the slide block |92 is held in lowered position with respect to the arm |36 so as to be out of engagement therewith. When, however, the link |9I is moved downwardly in connection with a dumping operation the arm |92 is swung counter-clockwise in Fig, l0 into engagement with the arm |36. The arrangement is such that upon such swinging movement of the arm |92 the arm |36 is moved upwardly out of engagement with the bracket |40, serving by such movement to carry the arm out of engagement with the pin |38, serving thus eifectively to disconnect the weight |39 from the scale bars 39 and 40.

As has already been explained, when retarder is being fed to the scoop I3 through the medium of the high speed driving means for the feeding mechanism the weight |39 is supported by the bracket |40 out of operative engagement with the scale bar 39, such weight |39 serving to stop the swinging movement of the scale bar 39 shortly after the initial movement thereof, During the feed of the retarder to the scoop I3 through the medium of the low speed driving means for the feeding mechanism, the weight |39 is supported largely by the bracket |40, but the arrangement is such vthat the scale bar 39 cannot be drawn downwardly into fully balanced position with respect to the stucco in the hopper I2 without raising the weight |39 from the bracket |40. The arrangement is such that the scale bars for both the stucco and the retarder are adapted to stand in their central balancing position when the weight |39 is effectively connected with the scale bar 39, and the counterbalancing system is regulated for obtaining accurate proportioning of the parts upon this basis. When the slide block |20 is moved toward the left in Fig. 29, however, for dumping the retarder from the scoop I3, the weight |39 is disconnected from the scale beam 39 so as to cause the scoop I3 and its connected parts to stand slightly below the central balanced position when in condition for dumping.

Means is provided for preventing the operal' tion of the dumping means for the scoop I3 except when the scoop I 3 stands at substantially the central balancing position, or very slightly below such central position as above suggested. This means comprises a dog |94 which is normally supported in position opposite the slide block |20 as shown in Fig. 29 for preventing movement of the slide block toward the left in said figure. During the time when the lever |11 stands in its raised position as shown in Figs. 2l, 22 and .23 correspending to the position of the flap or gate |0| as shown in Fig. 32, the dog |94 is supported in the position as shown in Fig. 29 by means of a short rod |95 which extends through the dog |94 and through the bracket |93 carried by the link |18, When the lever |11 is moved downwardly by engagement of the pin or bolt therewith as shown in Fig. 20, the link |18 is moved downwardly against the action of the spring |84 into the position as shown in Fig. 29 in which the support for the dog |94 by the rod |95 is withdrawn. When the rod |95 is moved downwardly with the link |18, the dog |94 is then supported by an arm |98 which is pivotally mounted upon a link |91 connecting the vertical supporting bar 31 with the vertical frame bar |22. As will be appreciated from the description above, the lever |11 and the link |18 are given a downward movement only when a balance has been established between the scoop I3 and the hopper I2. The rod |95 and the link |18 accordingly support the dog |94 during the balancing operation. The arrangement is such that when the scoop I3 is in balanced condition with respect to the hopper I2 the parts stand in the position as shown in Fig. 34 with the arm |96 at a suiiiciently lowered position for permitting the slide block |20 to move toward the left into a position as shown in Fig. 34 opposite the dog I 94 If for any reason the magnet |28 might be deenergized before a balance is established between the scoop I3 and the hopper I2, and the lever |11 should accordingly be moved downwardly for applying the weight of the dog |94 to the arm |96 before such balance had been established,

the dog |94 would then be held by the arm |98 in position opposite the slide block |20 so as to prevent movement of the block toward the left in Figs. 29 and 34- Means is also provided for preventing operation of the dumping mechanism in case an excessive amount of retarder should be fed to the scoop I3. This means comprises a bolt |98 pivotally mounted upon the vertical bar 31 so as just to clear the slide block |20 when the slide block is in 'normal position as shown in Fig. 29. The bolt |98 is arranged in such position as to clear the side block |29 vertically when the scoop I3 and the supporting bars 31 are in substantially balanced condition with respect to the hopper I2 but so as to extend opposite the slide block |20 `so as to prevent movement of the block toward the left in Fig. 29 when and if the scoop I3 should move any substantial distance below its central balancing position. A bracket I 99 is mounted 'upon the frame bar |90 in position to support-the thrown into operation for driving the stucco de- AVlivering devices 58 and for shifting the arm |58 Afromithe positionrshownzin sFig.r24 A.to ftheiposition showriiin'-Fig.25 serving through :thelinksl 9 and 1Hit tofmovethei-clutch member |02'itoward`the :right inFig.110for'.throwing.the high spe'edldriving means 1f or 1the fre'tarder f. delivery mechanism into operation,-kthe.aparts assuming `the 'positions as showndnzFig. `21. 'When a certain? predetermined amount ofretarderhas'been deliveredto'the scoop `rI 3,"the.;-parts fmove from I.the .positions shown 1in Fig.z v1.6 'to the po'sitionsfsliown l'in 17, serving tol close the `mercury switch |:3| -for .energizing vthe smagnet 128 Lwhich promptlyi'm'oves rthelrarts to the positions as Vshown'in' vFig..-22;'-servin`g to movethe clutch member `.|132towardtherleftfin Fig. 10 out of engagementwith the clutchmem- `ber |03 and serving through the linkl lf'iltotighten A.the brake band ||2 upon'the-fh'ead forstopping'the high speed delivery of iretarder, theparts moving to the positions asshown-inFig. 22.

`When the predetermined. desired4v amount of stucco has'been delivered to thehopper |2, the scale bar 29 rises -to the position as shown in fFig. 3, closing the mercury switch 92 for ener- .gizinglthe' magnet A'l'and raising vthe dog 16 for lpermittingthe link M to move toward theright 'in Fig. 4 for causing the readjustment of the parts =to the Vpositions asshown in Fig. 9, whereupon the cam T12 .upon its next following revolution Amoves the arm toward the left, carrying the .bar 80 and the link 3| also toward the left for swinging v'the lever V68 vin counter-clockwise di- :rection in Fig. 6 for throwing the-clutch 63 out of .operation for'stopping the rotation of -the stucco delivering devices .58. This vcounter-clockwise swinging-movement of the `lever 68 carries the .link 61 vtoward the lleft-,in Fig. 6, serving to swing the-.lever 65 .infcounter-clockwise direction into fwardthe'left in Fig.26).

.the position as shown in Fig. 1 whereby the link iI-'lS .is moved toward'tliie-right in said Fig. 1 (to- This servesthrough the .lever |J`|| "and the linls |10 to swing the arm |58 .from-thepositionshown in Fig. 25 to the position shown 'in Fig. 24, serving to carry 'the parts to thefpositions as shown in Fig. 23 by Which'move- 'ment -the clutch member |02 `is carried bythe link |86 .into engagement iwith the low speed driving clutch member 0A vfor initiating further delivery of retarder to the scoop I3. f

When the -weightvof :the retarderin the scoop |13 reaches the predetermineddesired maximum, the A.parts move .from the positions as shown in Fig. 171to the'rpositions shown in Fig. 18, serving .to vopen-the switch |30 i'or-deenergizing the magnet-|2350 a'sto permit the springs 5d to move the parts tothe-positions asshown in Fig. 20, serving .through-the link l|86 to move the .clutch member f|02 again .to neutral position asl shown in Fig. 10. AThe downward'movement of the pin or bolt 55 to the positionas vshown in Fig. 20 depresses the .lever -lfliTfor-closing the flap or gate |0| and per- .mittingtherod to descend to the position as v-shown in Fig. 29 for transferring the weight of the-dog |94 to -the pivoted blarv|96 which is mov- :able vertically withthe scoop i3.

The lever l| 24 is .then to be Agiven a stroke'toward 'the left Vin Fig. 11 by theoperator for moving the slide block |20 -towardthe left in Fig. 29 for effecting adumping'movementof the scoop I3. At the startrof such movement of the slide block |20, vtherarm |89fdescendsppermitting `the weight 93 :fairly-'Well filled. With the parts'in the positions as-:shown in Fig. 20, upon a stroke of the lever 65 clockwisedirectionlin Fig. l, the clutch 63 is to raise the weight |39 for causing the .desired unbalanced condition ofthe scoop I3 and its contents so as to prevent undesired movements of the mercury switch i3! which would be'incident to` oscillation of the scale bars 39 and G0. '.At "I eth'e'fen'd @of -'the movement of 1theslideb1oclc {12|} toward lrthe left in Figs. 29 Tand "34, 'thelpats assume the positions as shown in Fig..80, flfor -causing the vcontents .of the scoop@ to .fall-"into -the `mixer M. `The vleven-524 is fthenitof-be moved again'toward .the `right into theposition shown in Fig. i1, and thecontents L'are tobe dump'edin any approved manner .fromth'e hopper @|f.2,.wher`e -upon the .partsrare in lposition -or `f'anothe'r T'cycle .of operations.

By 'the luse'fof @our improved 'fairan'gement,f`we `are assured that amountsio'f stucco '-'and 'retarder .having'the desired weight relationf are delivered .'to thereont'ainers vvi2 yand .lfand'are assured in lany event -that the `.desired ylratio'of weights is :attainedf'befcre"azdmpingcoperation of the retarder =is eiected since vthe f'dumping apparatus cannot l.beoperated .untilfthe desired balance is .brought about, the'weight ratio being established by the proper-setting of the ulcrum device 53 by which the relative eiective lengths of the Yrespective 'end portions of the bar 52'at opposite 'sides of the fulcrum device 53 are controlled. The `weights E@ and 33 are preferably to` be Vvaried to correspond to the weight ratio desired in order I to control the points at which the high peed retarder clutch and the stucco clutch are thrown out of operation.

While we prefer to' employ the form of apparatus as shown inour drawings and as above described, it is to be understood that we do not limit our inventionto. the form shown except so far as the claims may be so limited by the prior art, it being understood that changes might well be made in the form and arrangement without departing from the spirit of our invention.

We claimz- 1. In a. mechanism of the type described, the combination of two containers, means for supporting said containers and connecting them together adapted to causesaid containers to have vertical movement with respect to each other when the ratio of the weight of the materials in `one container to the weight of the materials 'in the other container passes a predetermined critia cal value, feeding means for each 'of said containers adapted upon operation to deliver materials to said container, means actuated by a downward movement of one of said containers ier automatically stopping the operation of the feedingmeans for said containerwhen the weight of the materials in said container Vreaches a predetermined maximum, and means adapted upon a relative vertical movement of said containers for automatically stopping the operation of the feeding means for theother container when the ratio of the weights of the materials in the rel spective containers reaches said predetermined critical value.

2. In a mechanism of the type described, the combination of two containers, means or'supporting said containers and connecting them together adapted to cause said containers to have vertical movementwith Arespect to each other when the ratio of the weight ofthe materials in one container Ato the weight of the materials yin the other container passes a predetermined critical value, feeding means for each of said containers adapted upon operation to deliver materials to said contain-er, means actuated by 'a fln downward movement of one of said containers for automatically stopping the operation of the feeding means for said container when the weight of the materials in said container reaches a predetermined maximum, means actuated by the relative movement of said containers for automatically stopping the operation of the feeding vmeans for the other container when the ratio of weights of the materials in the respective containers reaches said predetermined critical value, and means for preventing the delivery of materials by the feeding means for said other container after said feeding means has been thrown out of operation.

3. In a mechanism of the type described, the combination of two containers, means for supporting said containers and connecting them together adapted to cause said containers to have vertical movement with respect to each other when the ratio of the weight of the materials in one container to the weight of the materials in the other container passes a predetermined critical value, feeding means for each of said containers adapted upon operation to deliver materials to said container, means for stopping the operation of the feeding means for one of said containers when the weight of the materials in said container reaches a predetermined maximum, means for stopping the operation of the feeding means for theother container when the weight of the materials in said other container reaches a predetermined maximum, means for starting the operation of the feeding means for said other container at a comparatively slower speed when the operation of the feeding means for saidvone container is stopped, and means for again stopping the operation of the feeding means for said other container when the ratio of the weightsof the materials in the respective containers reaches said predetermined critical value. 4. In a mechanism of the type described, the combination of two containers, means for supporting said containers and connecting them together adapted to cause said containers to have vertical movement with respect to each other when the ratio of the weight of the materials in one container to the weight of the materials in the other container passes a predetermined critical value, feeding means for each of said containers adapted upon operation to deliver materials to said container, means for stopping the operation of the feeding means for one of said containers when the weight of the materials in said container reaches a predetermined maximum, means for stopping the operation of the feeding means for the other container when the Weight of the materials in said other container reaches a predetermined maximum, means for starting the operation of the feeding means for said other container at a comparatively slower Speed when the opera-tion of the feeding means for said one container is stopped, means for again stopping the operation of the feeding means for said other container when the ratio of the weights of-the materials in the respective containers reaches said predetermined critical value, and means for preventing the delivery of materials by the feeding means for said other container after said feeding means has been thrown out of operation.

5. In a mechanism of the type described, the combination of two containers, scale beams in counterbalancing relationship to said containers respectively, operative connections between said scale beams adapted to prevent one of said scale beams from rising substantially above its central balanced position while the other scale beam is standing approximately at or above its central balanced position, feeding means for each of said containers adapted upon operation to deliver materials to said container, means adapted upon the upward movement of the scale beam for one of said containers for automatically stopping the operation of the feeding means for said `container when the materials in said container are balanced with respect to said scale beam, and means adapted upon the upward movement of the scale beam for the other container for automatically stopping the operation of the feeding means for said other container when the ratio of weights of the materials in the respective containers reaches a predetermined critical value.

6. In a mechanism of the type described, the combination of two scale mechanisms each comprising a container for the materials to be weighed and each having a depending link for detachable connection of graduated weights thereto, a substantially horizontal bar pivotally connected between said links, a fulcrum device mounted above said bar and adjustable therealong in position to engage said bar so as to prevent either one of said links from rising substantially above its central balanced position while the other link is standing substantially at or above its central balanced position, feeding means for each of said containers adapted upon operation to deliver materials to said container, means actuated by downward movement of one of said containers for automatically stopping the operation of the feeding means for said container when the weight of. the materials in said container reaches a predetermined maximum, and means actuated by the upward movement of the scale beam for the other container for automatically stopping the operation of the feeding means for said other container when the materials in said other container become balanced through said bar with the materials in said one container.

7. In a mechanism of the type described, the combination of two containers, scale beams in counter-balancing relationship to said containers respectively, operative connections between said scale beams adapted to prevent one of said scale beams from rising substantially above its central balanced position while the other scale beam is standing approximately at or above its central balanced position, feeding means for each of said containers adapted upon operation to deliver materials to said container, means for stopping the operation of the feeding means for one of said containers when the materials therein are balanced with respect to said scale beam, a mercury switch carried by the scale beam for the other one of said containers, means adapted upon an upward movement of said scale beam to give said mercury switch an angular swinging movement, and means adapted upon such swinging movement of. said switch for throwing the feeding means for said other container out of operation.

8. In a mechanism of the type described, the combination of two containers, means for supporting said containers and connecting them together adapted to cause said containers to have vertical movement with respect to each other when the ratio of the weight of the materials in one container to the weight of the materials in the other container passes a predetermined critical value, feeding means for each of said containers adapted upon operation to deliver materials tofsaidcontainer,,means adapted by an operative stroke to empty one of said containers, and means for preventing the operation of said container emptying means when said container stands substantially above or substantially below its-central balanced position with respect to the other container. t

9. Ina mechanism of the type described, the combinationof two containers, means for supporting said .containers and connectingv them together 4adapted to cause said containers to have vertical movement with respect to each other whenthe ratio of the weightlof the materials in one container to-the weightof the 4materials inv the other container-,passes a predetermined critical value, feeding means for each of said containers adapted upon operation to deliver materialstoisaid container, aslide block adapted by an-operativestroke in one directionfto empty one of said containers, and stopsmovable vertically with said container adapted byA engagement withg `10. In a mechanism of the type described, theV combination oftwo containers, means forsupporting said containers and connecting them to vgether adapted to cause saidcontainers to have vertical movement with respect to each other when the ratio of theweight of the materials in one container to the weight of` the materials in the other container passes a predetermined critt ical value, feeding means for each of saidcontainers adapted upon operation to deliver materials to said containers, means adapted by an operative stroke tol empty one of said containers, a pawl pivotally mounted on a fixed axisadjacent to said container, means adapted by cooperation with said pawl when the pawl is in operativeposition to prevent operation of said container emptying means, yielding means-adapted normally to support said pawl in its operative position, and means actuated automatically by a relative vertical movement of fsaid containers when the desired weight ratio has been established .to move said pawl supporting means out of operative supporting position. f n y y 11. In a mechanism of thetype described, the combinationof two containers, means forsupporting said containers and connecting them together adapted to cause said containers to have vertical movement withrespect to each other when'the ratio of the weight of the materials in one container to the weightof the materials in the other container passes a predetermined criticalA i desired weight ratio has been established to move said pawl supporting means out of operative supporting position, and yielding means carried by said container and movable vertically with the container for supporting said `pawl when said rst namedyielding means is moved out of supporting position, saidlast named yielding-meansv being adapted to hold said pawl in position to prevent operation .of the container lemptying means until said container is moved vertically'tosubstantially its central balanced position upon thev establishment of said predetermined weight ratio;

V12.111 armechanism lof the type described,

the combination of two containers, means for supporting said containersand connecting them together adapted to cause said containers tohave vertical movement with respect to each other when the ratio of the weight of the materials in one container to the weight of the materials in the other container passes a predetermined critical value,feeding means for each of said containers adapted upon operation to deliver materials to said container, means adapted by an operative stroke to emptyone of said con-- tainers, a pawl pivotally mounted on a fixed nis adjacent to said container, meansadapted.

by cooperation with said pawl when the pawl is in operative position to prevent operation of said container emptying means, yielding means adapted normally to support j said pawl in its Voperative position, means actuated 'automatically by a relative Vertical movement of said containers when the desired weight ratio has been establishedto move said pawl supporting means out of operative supporting position, and an arm pivotally mounted at anintermediate point-on said container assembly so asto have vertical movement bodily with said container adapted yieldingly to support said pawl when said rst named yielding means is moved out of supporting position. k-

13. In a mechanism of the type described, the combination of a scale beam, a container` supported by said beam and movable vertically therewith, means for feedingmaterials to said container, aY horizontally disposed bar pivotally mounted on said scale beam, a weight on said bar at the end portion thereof oppositethat at which said container is connected with said beam, means adapted normally to support said weight independently of said beam while the con-y ported by said beam and movable verticallyl therewith, means forvfeedingmaterials to said container,` a horizontally disposed bar pivotally mountedon-said scale beam,ia weight on said bar at the end portion thereof opposite that at which said container is connected with said beam, means adapted normally to support said weighty,A independently of said beam while the container stands its raised position, means adapted shortly after the start of the balancing downward movement of the container to connect said weight effectively. with said beam for opposing further downward movement of the container, means actuated by said initial downward movement of the container to throw said feeding meansout of operation, cooperating means adapted thereafter to throwsaid feeding.means again into operation, and means actuated by further downward movementl of the container ,against the action of said weight again to throw said feeding means out of operation.

y15. In a mechanism of the type described, the combination of a scale beam, a container supported by said beam and movable vertically therewith, means for feeding materials to said container, a horizontally disposed bar pivotally mounted on said scale beam, a weight on said bar at the end portion thereof opposite that at which said container is connected with said beam, means adapted normally to support said weightindependently of said beam while the container stands in its raised position, means adapted shortly after the start of the balancing downward movement of the container to connectsaid weight effectively with said beam for opposing further downward movement of the container, means actuated by said initial downward movement of the container to throw said feeding means ,out of operation, cooperating means adapted thereafter to throw said feeding means again into operation, means actuated by further downward movement of the container against the action of said weight again to throw said feeding means out of operation, means adapted by an operative stroke in one direction to empty said container, and means adapted upon the initial portion of the operative stroke of said emptying means to lift said weight out of effective engagement with said beam whereby the container shall be thrown out of its balanced condition and assured against upward movement.

16. In a mechanism of the type described, the combination of a scale beam, a container supported by said beam and movable vertically therewith, means for feeding materials to said container, a horizontally disposed bar pivotally mounted on said scale beam, a weight on said bar at the end portion thereof opposite that at 'which said container is connected with said beam, means adapted normally to support said weight independently of said beam while the container stands in its raised position, means adapted shortly after the start of the balancing downward movement of the container to connect said weight effectively with said beam for opposing further downward movement of the container, means actuated by said initial downward movement of the container to throw said feeding means out of operation, cooperating means adapted thereafter to throw said feeding means again into operation, means actuated by further downward movement of the container against the action of said weight again to throw said feeding means out of operation, means comprising a slide block adapted by an operative stroke in one direction to empty said container, and means comprising a second weight movably mounted adjacent to said beam and normally held by said slide block out of operation but adapted at the initial portion of the movement of said slide block to move said horizontally disposed bar upwardly for supporting said first named weight free from said scale beam for throwing the container` out of its balanced condition.

17. In a mechanism of the type described, the combination of two containers, means comprising a train of levers supporting said containers and connecting them together adapted to cause said containers to have vertical movement with respect to each other when the ratio of the weight of the materials in one container to the weight of the materials in the other container passes a predetermined critical value, a drive shaft, means comprising a clutch mounted on said shaft adapted when in operation to feed materials into one of said containers, means including a link movable toward and from the shaft for throwing said clutch into and out of operation, an arm pivotally mounted so as to swing toward and from the shaft, a pawl on said arm adapted to stand out of operative engagement with said link when the arm is at the limit of its motion away from the shaft but adapted to have operative engagement with the link for moving the link in the direction away from the shaft when the arm stands at the limit of its motion toward the shaft, means on said shaft adapted by engagement with said arm to swing the arm away from the shaft, latch means for holding said arm releasably at the limit of its movement away from the shaft, means for feeding materials to the other one of said containers, means adapted when the materials in said other container reach said predetermined weight ratio with respect to the materials in said one container to release said latch means, and yielding means adapted when said latch means is released to move said arm toward the shaft for engagement through the pawl with the link and consequent movement of the clutch out of operation.

18. In a mechanism of the type described, the combination of two containers, means comprising a train of levers supporting said containers and connecting them together adapted to cause said containers to have vertical movement with respect to each other when the ratio of the weight of the materials in one container to the weight of the materials in the other container passes a predetermined critical value, a drive shaft, means comprising a clutch mounted on said shaft adapted when in operation to feed materials into one of said containers, means including a link movable toward and from the shaft for throwing said clutch into and out of operation, an arm pivotally mounted so as to swing toward and from the shaft, a pawl on said arm adapted to stand out of operative engagement with said link when the arm is at the limit of its motion away from the shaft but adapted to have operative engagement with the link for moving the link in the direction away from the shaft when the arm stands at the limit of its motion toward the shaft, means on said shaft adapted by engagement with said arm to swing the arm away from the shaft, latch means for holding said arm releasably at the limit of its movement away from the shaft, means for feeding materials to the other one of said containers, a spring having effective bearings on said arm and said link tending to press said link away from the shaft when said arm stands at the limit of its movement away from the shaft and tending to press said arm toward the shaft when the link stands at the limit of its movement toward the shaft, and electrically operated means adapted when the materials in said other container reach said predetermined weight ratio with respect to the materials in said one container to release said latch means.

19. In a mechanism of the type described, the combination of two containers, means for feeding materials to one of said containers comprising a clutch, means comprising a horizontally swinging lever for throwing said clutch into operation upon movement in one direction and arranged to be given a movement in the opposite direction when said clutch is thrown out of operation, means for feeding materials to the other container, means comprising a clutch for driving 

